package com.nms.filters;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

/**
 * 
 * 该类用于设置接收页面输入信息的编码设置为一定的字符集
 */
public class SetCharacterEncodingFilter implements Filter{
 
	protected String encoding;
	protected FilterConfig filterConfig;
	
	public SetCharacterEncodingFilter()
	{
		this.encoding = "UTF-8";
		this.filterConfig = null;
	}
	
	public void destroy() {
		this.encoding = null;
		this.filterConfig = null;
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		request.setCharacterEncoding(this.encoding);
		chain.doFilter(request, response);
	}

	public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;
		this.encoding = filterConfig.getInitParameter("encoding");
	}

}
